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20
Science
7th Grade
02/19/2014

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Cards

Term
Theory of continental drift
Definition
continental drift is proposed by Alex Wegner in 1912. it says that the continents were once one big strip of land
Term
fossil clues
Definition
Similar to plant and animal fossils found on both sides of Atlantic ocean
Term
Climate clues
Definition
Glacial evidence in warmer climates, and Fossil ferns in cold climates
Term
Rock Clues
Definition
Similar to rock types found on both sides of Atlantic Ocean
Term
Seafloor spreading
Definition
proposed by Henry Hess in 1960's
Term
Proof 1 seafloor spreading
Definition
newer rocks near Mid-Atlantic Ridge
Term
proof 2 seafloor spreading
Definition
magnetic clues in rocks
Term
Wegener
Definition
Has no proof
Term
Wegener
Definition
No explanation how it happened
Term
Plate tectonic theory
Definition
crustal sections/plates move around mantle
Term
how do plates move
Definition
plates move by currents
Term
how many major plates
Definition
13-14
Term
convergent
Definition
plates come together
Term
Continental collision
Definition
two continental plates collide
Term
Subduction
Definition
denser oceanic plate goes under less dense continental plate
Term
divergent
Definition
plates separate
Term
seafloor spreading
Definition
two oceanic plates move apart
Term
rift valley
Definition
two continental plates move apart
Term
transform
Definition
plates slide by each other
Term
continental collision forms ?
Definition
mountains
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